16772880

Appears in sequences

• Number of aperiodic binary strings of length n; also number of binary sequences with primitive period n.at n=24A027375
• Row sums of triangle T(m,n) = number of solutions to 1 <= a(1) < a(2) < ... < a(m) <= n, where gcd(a(1), a(2), ..., a(m), n) = 1, in A020921.at n=23A038199
• Number of 4-ary sequences with primitive period n.at n=12A054719
• Number of primitive (aperiodic) words of length n which contain exactly two different symbols.at n=23A056267
• Number of primitive (aperiodic) palindromes using a maximum of four different symbols.at n=23A056460
• Number of length 6 primitive (=aperiodic or period 6) n-ary words.at n=16A218130